William Jerome Koessl, 58, of Ellison Bay, passed away unexpectedly on Monday, January 12, 2026 at his residence after an apparent heart attack.
He was born May 2, 1967, in Algoma, the son of Jerome and Patricia (Witalison) Koessl. Bill attended Gibraltar High School and graduated with the class of 1985. On September 22, 1990, he married Sheila Voight and lived in Ellison Bay.
William worked as a truck driver for several local businesses, most recently, Septic Maintenance. He was a member of Shepherd of the Bay Lutheran Church. William had a great interest in tractors, especially Oliver tractors, and the history of Oar Boats.
William will be missed by his wife, Sheila; son, John Koessl; daughter, Casey (Brandon) Honold; four grandchildren, Mason, Nora, Toby, and Alvena; siblings-in-law, Larry Voight, Lyle Voight, Leon (Lynne) Voight, and Cheryl (Jeff) Muhowski; and his dog, Maggie Mae. He was preceded in death by his parents; and brother, Edward Koessl.
William's life will be honored with a Celebration of Life in the spring.
Memorials may be given in his name to the Door County Maritime Museum, 120 N Madison Ave, Sturgeon Bay WI 54235; www.dcmm.org. Casperson Funeral Home & Cremation Services, LLC in Sister Bay is assisting the Koessl family. Expressions of sympathy, memories, and photos of William may be shared with his family through his tribute page at CaspersonFuneralHome.com.
